Red dye.



' the German Empire, residing at.Dresden,

I mixture .is prepared from 8 kilograms of useful Improvements in New Red Dyestufi's,

ate compounds. -ta-ined on starting from dinitrophenylpy- ,nary temperature or in oacuo at 100 C.

UNITED STATES PATENT OFFICE.

WALTER KONIG, OF DRESDEN, GERMANY, ASSIGNOR TO FARBENFABRIKEN VORM. FRIEDR. BAYER 6c 00., OF ELBERFELD, GERMANY, A CORPORATION OF GERMANY.

RED D'Yii.

Specification of Letters Patent. Patented Feb. 23, 1909.

Application filed November 30, 1908. Serial No. 485,108.

To'all whom it may concern:

Be it known that I, WALTER KoNIG,

scopic, violet-brown needles having a blue doctor of technical arts, chemist, citizen of luster which are easily soluble in alcohol, glacial acetic acid and in hot water with a red color. The new dyestuff dyes tanned cotton a beautiful yellowish-red shade.

The process described in the above ex ample can he changed in different-ways by using c. 1 other diluents, such as glacial acetic acid, pyridin, benzene, ether etc. or by carrying out the reaction in an aqueous solution or emulsion; or an aqueous solution of cyanogen broinid orchlorid may be used; the production of which is described in Relic/[tr dc) Dcutsc/mn Ulzemischcn G'es-cllschaft 28, p. 2471 and 29, p. 1823.

instead of pyridin its gamma and beta substitution products can be used c. g. betapicolin, gainma-picolin, beta oxypyridin. beta-chloropyridin etc. and other substitu tion products of phenmorpholin or plnur morpholin itself may be used.

Having now described my invention and in what manner the same is to he performed. what I claim as new and desire to secure by Letters Patent ise- 1. The herein-described new basic dycstutl's' obtainable from cyanogen halogciiid pyridins and pbemnorpholins. especially phenmorpholi'n and its substitution products.

Saxony, Germany, have invented new and of which the following is a specification.

NLwinrention relates to the manufacture and production of new red to violet basic dyestufl's which apart from their great coloring power are remarkable for their very clear shades fastto washing and to light. The can he dyed on tanned cotton and are red ish )roducts soluble in hot water with a red (:0 or. i

The process for their production consists in treating phenmorpholins, especially phenmorpholin and its substitution products, with pyridins and cyanogen halogenids, which yield cyanpyridiniums as intermedi- The same dyestuffs are ob ridinium salts instead of cyanogenpyridiniums.

in order to illustrate the new process more fully the following example is given. A

pyridin, liters of methyl alcohol and 29.8 kilograms of methylphen-morpholin.

/\/o\(EH which dyes are reddish products soluble in t hot water With :1 red color: aiubdycmn tanned cotton red shades. substantially as described.

2. The herein-described new basic dycstutt obtainable from cyanogen hromid. pyridin and mctbylphcnmorpholin. which forms. after being dricd. miscroscopic riolet-brown needles which are easily soluble in alcohol. glacial arctic acid and hot water with a red color: and which dye tanned cotton yellowislrrcd shades. sub tantially as described.

To this mixture 50 liters of a double normal solution of cyanogen bromid in ether or benzene (containing 212 grams of BrCN in one liter] are added in the course of half an hour. The mixture grows hot and soon becomes red and opaque. After having been stirred for about 12 hours at the ordinary tenaperature so much of dilute h 'drochloric aci is added to the mass of tie reaction that a. thick pulpy mass results and the li uid that covers this mass is only slightly co ored. The dyestufl' is then filtered off with suction, washed with a small quantity of hydrochorie acid and dried at the ordimy hand in the presence of two subscribing In testimony whereof I have hereunto set i It is thus obtained in the shape of micro- 

